Coluber viridiflavus, Western Whip Snake, Dark Green Snake, Biacco

Range:
This is one of Italy's most common snake species and is found over the whole
of Italy including Sicily, Sardinia and other coastal islands.

Identification:
Full adult colouring in fourth year
19 back scales across the mid-body, 187-227 belly scales (187-212 in males and
197-227 in females) and 95-125 pairs of scales beneath the tail.
Adults of this species can grow up to 150cm and beyond, they are slender with
a smallish, well defined head with smooth scales and prominent eyes with large
round pupils. Unfortunately there is a marked variation in the colour of this
snake, adding to confusion over species identification. Throughout the south
of Italy and Sicily, this species is almost entirely black, but on a whole they
tend to have a greenish-yellow ground colour with black/dark green pigment forming
crossbars or foreparts over the body to yellowish streaks or rows of spots. The
tail of this species is very distinct and the striping is usually much more visible
here. The underbelly is yellowish or greyish (rarely reddish) and sometimes has
small darker spots.

Juvenile Western Whip Snake

The juveniles have a very distinct head pattern with light
bars between the eyes and spots on the parietal scales with a 'V' or 'W' shaped
mark behind these. Their body tends to be a pale grey or olive.
This species is often confused with the Balkan Whip Snake (Coluber gemonensis),
and although their range does overlap, in respect to Italy, the Balkan Whip snake
only occurs in the extreme north east.

Similarly, it has also been likened to
the Horseshoe Whip Snake (Coluber hippocrepis) which occurs in the south west
of Sardinia and also confused with some of the Rat snake (Elaphe) species found
in Italy, but these tend to have characteristic patterns and higher numbers of
dorsal scale rows. Another similar species is the Montpellier snake (Malpolon
monspessulanus) which occurs in Liguria and Trentino only and has a distinct
head shape.

Habits and Behaviour:
This is a frequently spotted, largely diurnal and terrestrial
species. It is also a good climber and can be found in a wide range of habitats
of mainly dry, open but well vegetated habitats up to 1500m. This species hibernates
usually during September to April, in rock cracks, mammal burrows and outbuildings,
sometimes communally. It is known to travel quite long distances between it's
summer and winter quarters, but when active during the summer they have a very
limited area which they use, which has been known in Italy to cover 3,000 metres
squared only. Within this area, the snake will hide in the shade during the hottest
part of the day and find areas to bask and feed. This snake is very fast and
agile, hunting by sight, and is incredibly aggressive if caught or cornered,
biting hard and persistently. Food includes many lizards, small mammals, nestling
birds, snakes and frogs. Juveniles eat insects and small lizards and lizard eggs.
Males may travel up to 3km to find a mate and will fight with other males, lashing
each other with their tails. Females lay between 4-15 elongate eggs, often between
4-7 eggs in Italy, and they are about 30-40mm by 15-22mm in size with star shaped
concretions on the shell. After around 6-8 weeks these will hatch with snakes
of around 20-25cm long, with the described juvenile coloration until they take
the adult markings after 4 years.